Hot-air heater.



Patented Oct. 2|, I902.

W. P. HARTFORD. HOT AIR HEATER. (Application filed May 31, 1902.) (No Model.) 2 Sheets8heet l.

WITNESSES VEN TOR n4: NORRIS PEYiRS co. Puo-mumm wAsumc'mw, u. c

No. 7||,s53. Patented Oct. 2|, 1902 w. P. HARTFORD.

HOT AIR HEATER.

(Application filed May 31. 1902.)

2 Sheets-Sheet 2.

(No Model.)

w1nvss5s //v VEN TOR 1 161 Horriford By 1 ATTIORNEYJ:

' UNITE STATES PATENT OFFICE.

WILLIAM PRESTON HARTFORD, OF OASSVILLE, WISCONSIN.

HOT-AIR HEATER.

SPECIFICATION formingpart of Letters Patent No. 711,853, dated October 21, 1902. Application filed May 31. 1902. Serial No. 109,695. (No model.)

To 001% whmn it may concern:

Be it known that I, WILLIAM PRESTON HARTFoRD,residing at Oassville, in the county of Grant and State of Wisconsin, have invented certain new and useful Improvements in Hot-AirI-Ieaters, of which the following is a specification.

My invention relates to thatclass of hot-air heaters or furnaces more particularly adapted for burning wood and in which the draft means is especially arranged to provide for automatically maintaining a substantially uniform draft through the combustion-chamber irrespective of the varying drafts in the chimney, and it specifically provides for certain improvements in the form of furnace disclosed in my Patent No. 689,078, dated December 17, 190 1.

Primarily my invention seeks to provide certain improvements in the general construc tion of'my patented furnace referred to whereby to cheapen the cost of building the same, reduce the weight thereof, and render the packing of the parts the more compact for shipping, and, further, to materially increase the heating capacity thereof with a minimum cost of fuel. v

Among other features my present invention comprehends a new and improved construction of automatically-operating check-draft device whereby the same will be caused to tip quicker and recover more promptly than is possible in the use of the type of check draft device shown in my patent referred to.

In its more complete nature my presentinvention includes a novel arrangement of baffie-plates for cooperating withthe combustion-chamber in creating a strong draft and discharging the cold air against the heater-- body in such manner as to prevent the said bodybecoming overheated and also for heating a larger amount of air than is possible in my other form of heater or furnace by reason of spreading the samein a uniform manner over the entire length of the heating-surface.

In its more subordinate features my invention consists in certain details of construction cially pointed out in the appended claims, reference being had to the accompanying drawings, in which- Figure 1 is a longitudinal section of my improved heater. Fig. 2 is a transverse section thereof on the line 2 2 of Fig. 1. Fig. 3 is a detail perspective view illustrating the general arrangement of the combustion-cylinder and the superheating-drum. Fig. 4 is a detail view illustrating the gravity-closed automaticallyoperatingcheck-damper and its locking-detent.

In the accompanying drawings the arrows 1 indicate the source and flow of the fresh air, and the full lines, arrows 2, indicate the direction of-the heat and gas generated in the furnace.

The combustion-chamber A in my present invention is formed of a cylindrical shell a, suitably bolted or riveted to the front and rear head-plates A A as clearly shown in Fig. 1, by reference to which it will also be noticed the shell a is mounted on the piers a a of the brickwork of easing C, and the front headplate A has a door D hinged thereto and provided with the direct-draft door K, which is arranged the same as in my patented construction. The rear head-plate A has an integral or otherwise fixedly held ,oiftake pipesection A the purpose of which will presently appear.

G G designate fresh-air inlets that open under the combustion-chamber A, one of said inlets being disposed at each side of the said chamber, and in the practical arrangement of my heater the said inlets may communi: cate with the cellar-room or through the usual form of air-ducts with the outer atmosphere.

B designates the smoke-drum or supplemental heater, which in my present construction is of a smaller diameter than that of the combustion-chamber A, such correlative arrangement of the parts A and B being provided to facilitate the nesting of the heater parts for shipping. The drum B has its ends riveted or otherwise made fast to thelhead or 5 back plates B B which have flanges b b for tion with the offtake A of the combustionchamber A.

J designates the smoke-pipe, which joins with the discharge-opening Win the outer end of the front plate 13, and H H designate the hot-air oiftakes that lead to the several rooms or apartments to be heated.

M M designate baffie-plates, which are horizontally disposed one at each side of the combustion-chamber and over the cold-air inlets or spaces G. As will be noticed from the drawings, the plates M extend the full length of the combustion-chamber A and have their inner ends m disposed close up to the sides of the chamber A, whereby to provide a narrow throat or air-passage m m at each. side for the passage of the air into the heating-space that surrounds the chamber A and the drum B. The baffle-plates M consist of thin metal sheets slipped into slots Z Z in the end castings or head portions A A and the said plates are of a width to extend into the brick casing or wal1s,as shown. By providing the baflie-plates M, arranged as shown and described, a much largeramount of air is heated and delivered to the rooms above than is possible in my patented furnace, for the reason that the air cannot in my present construction pass up over the sides of the heating-surfaces in a mass or bulk, as the plates spread said air out evenly the whole length of the furnace, except when in some part of the combustion-chamber the fire is hotter. Then that part of the furnace will cause a stronger draft and more air to strike against the said hot portion, which action will, as it were, automatically keep the furnace-body at substantially the same tem-' 'terit may be slightly below the same, as

shown-in such manner that it will swing easily, as conditions may require, and it is also provided with lips s s at the upper and lower ends to prevent its upper end swinging too far outward. The lower half of the valve is weighted to cause it to normally gravitate to its closing position, and the said valve carries a rod 8 centrally pivoted on the outside thereof, which rod is arranged to swing around so as to either act as an adjustable counterpoise when turned down, as indicated in Fig. l, or as a detent or look to hold the valve S open when it is turned up tothe position shown in Fig. 4. By arranging the check-draft in the manner shown close up to the smoke-outlet J it is obvious that the same will be very sensitive to the slighest changes in the suction-draft created in the drum B. The upper edge of the check-Valve is comparatively close to the smoke-pipe, thus ent to those skilled in the art to which it ap-- pertains.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a furnace of the character described, a combustion-chamber, a hot-air casing surrounding the same, having the usual oiftakes, cold-air inlets at a point below the combustion-chamber, and baffle-plates over the said inlets extending the full length of the combustion-chamber and having their inner edge disposed close up to the sides, of the said combustion-chamber, whereby to provide a restricted air-passage at each side of the said combustion-chamber and extending the full length thereof, as set forth.

2. In a furnace of the character described,

the combination with the combustion-chamber A, including its head portions A A and a hot-air casing surrounding the same having the usual offtakes; of a cold-air space at each side of the combustion-chamber and extending lengthwise under the said chamber, said spaces having inlets, baffle-plates mounted in the casing-walls, one at each side of the combustion-chamber, said baflie-plates extending over the fresh-air spaces and having their inner edge extended close up to the sides of the combustion-chamber, whereby to provide a restricted air-passage extending the full length of the combustion-chamber, the inner ends of said baffle-plates being supported in the head-plates of the combustion-chamber, all being arranged substantially as shown and described.

3. In a furnace of the character described, the combination with the drum or chamber B,having the usualsmoke-outlet B andjoined with the combustion-chamber, as shown, said drum also having a vent-opening adjacent the smoke-discharge; of the gravity pivoted valve 8 operating in the openings, said valve having a pivoted rod, said rod being swing able to act as a counterpoise when in one position, and as a detent for holding the valve open when swung to the other position, all being arranged substantially as described.

4. The, hereinbefore described improved hot-air furnace, comprising incombination, a combustion -chamber, including the cylindrical body ct, the front and rear heads A A the front head having a direct draft-opening, the rear head having an upwardly-extendin g offtake-pipe section, a drum mounted lengthtion from the smoke-outlet, the baffle-plates Wise over the combustion-chamber A, said M, and the surrounding casing, all being ar- [0 drum having a pendent intake adapted to be ranged substantially as shown and for the detachably connected with the ofltake of the purposes described.

combustion-chamber, said drum B having a WILLIAM PRESTON HARTFORD. smoke-outlet at its front end, a vent-opening I Witnesses:

adjacent the said outlet, at gravity-closing R. S. MULDOON,

valve in the said outlet governed by the suc- I G. A. STEVENS. 

